REAR ABS WHEEL-SPEED SENSOR INSPECTION


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Visual Inspection

1.  Inspect the sensor for looseness and damage. Replace the sensor if necessary.


Clearance Inspection

1.  Remove the ABS wheel-speed sensor.

2.  Measure the length A and B shown in the figure using vernier calipers.

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3.  Subtract B from A then verify the clearance between the wheel-speed sensor and the sensor rotor.

Clearance
0.3—1.1 mm {0.012—0.043 in}
•  If not as specified, replace the defective part(s). (ABS wheel-speed sensor, ABS sensor rotor, rear axle shaft and rear axle housing etc.)


Resistance Inspection

1.  Disconnect the ABS wheel-speed sensor connector.

2.  Inspect the resistance at the ABS wheel-speed sensor.

•  If not as specified, replace the ABS wheel-speed sensor.
Resistance
1.2—1.6 kilohm


Voltage Inspection

1.  On level ground, jack up the vehicle and support it evenly on safety stands.

2.  Disconnect the ABS wheel-speed sensor connector.

3.  Inspect each sensor by rotating each wheel one revolution per second.

•  If not as specified, replace the ABS wheel-speed sensor.
Voltage
0.15—1.2 V (AC)


Voltage Pattern Inspection

1.  Jack up the vehicle on level ground and support it evenly on safety stands.

2.  Disconnect the ABS wheel-speed sensor connector.

3.  Using an oscilloscope, inspect voltage pattern for distortion and noise by rotating each wheel.

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•  If there is distortion or noise, inspect the ABS sensor rotor.